Irwin
- Tapered drill w/widened flutes for drilling fast, clean pilot holes
- Adjustable 4-cutter counterbore cuts & clears chips quicker for fast, smooth countersinking
- Counterbore attaches to flats on shank w/2 hex screws for a secure fit
- Adjustable for controlled pilot hole depth
- 1/4" quick-change shank reduces slipping in standard chucks
- Compatible w/all 1/4" quick-change chucks, including impact drills
#12 screw size.
7/32" bit dia.
4-1/2"L
1/4" quick-change shank.